I get these freaky cramps when i'm about 10 mins into my run all the time! They feel like intense menstrual cramps and it gets worst when i stop to rest. They tend to ease for a few moments before coming back again and this would take about 15 min to slowly disappear. It makes me crouch and lie flat again and again: movement eases the pain slightly.
This is especially bad when i run at a higher intensity and longer period! ;( This has been going on for about 4 years! I went to see a doc a few years back and she told me something about me being inactive but i am not. I had this pain running 5 days a week. Even now when im nt as active!